In 1247, there was an individual called
Konrad von Tanzenberg who owned the castle. Documents show that the property in 1300 and 1341 was in the possession of the family Mordax (or Mordachs). The castle was acquired in 1513 by
Maximilian I, Holy Roman Emperor. The brothers Siegmund and Wolfgang von Keutschach, nephews of the
Archbishop of Salzburg Leonhard von Keutschach, began construction of the present-day castle in 1515. The palace, built in four wings around a rectangular courtyard, is one of Austria's most important Renaissance buildings. Presumably, under the supervision of Leonhard II, the son of Wolfgang von Keutschach, the castle was completed. The property remained in the possession of von Keutschach until the second half of the 17th century. The building fell into disrepair in the 19th century. In 1891, Georg von Gutmannsthal acquired the castle. In 1898, the
Olivetans acquired the castle and began its renovation into a monastery building. The two lower floors are from the original sixteenth century structure. In the northeast section, there are preserved components of the medieval castle. Replacing the former banqueting hall on the southwestern side, a monastery church was built in 1898. From 1942 until the end of the war in 1945, Tanzenberg Castle served as a
repository for the collections of the Central Library of the
Advanced School of the NSDAP. In 1946, it became a Catholic boys' boarding school for seminary candidates. In 1953, the castle became the property of the
Roman Catholic Diocese of Gurk. In 1995/1996, the facades were restored. == Architecture ==